#include <iostream>
using namespace std;
int main()
{
    int n,t,cnt = 0,a[100010];
    cin >> n;
    for(int i = 0; i < n; i++){
    	cin >> t;
    	a[t] = i;
    }
    for(int i = 0; i < n; i ++)
    {
        if(i != a[i])
        {
            while (a[0] != 0)
            {
                swap(a[0],a[a[0]]);
                cnt ++;
            }
            if(i != a[i])
            {
                swap(a[0],a[i]);
                cnt ++;
            }
            
        }
    }
    cout << cnt;
    return 0;
}